custom.tex

\usepackage{fancyhdr}
\usepackage{titlesec}
\pagestyle{fancy}
\fancypagestyle{plain}{\pagestyle{fancy}}
\fancyhf{} % clear all headers and footers
\renewcommand{\headrulewidth}{0pt} % remove rule between header and text
\fancyhead[R]{\thepage}
\titleformat{\chapter}[display]
  {\bfseries\large\rmfamily\filcenter}
  {\MakeUppercase{\chaptertitlename} \thechapter}
  {24pt}
  {\MakeUppercase}
\titleformat{\section}[block]
  {\bfseries\rmfamily}
  {\MakeUppercase \thesection}
  {18pt}
  {\MakeUppercase}
\titlespacing{\section}{10mm}{24pt}{18pt}
\titleformat{\subsection}[block]
  {\bfseries\rmfamily}
  {\thesubsection}
  {1pc}
  {}
\titlespacing{\subsection}{10mm}{24pt}{18pt}
\titleformat{\subsubsection}[block]
  {\mdseries\rmfamily}
  {\thesubsubsection}
  {1pc}
  {}
\titlespacing{\subsubsection}{10mm}{24pt}{18pt}